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Finding the Fourth Proportional to 92,987.64, 128,384.73 and 71,439

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Solution

The fourth proportional to 92,987.64, 128,384.73 and 71,439 is: 98,633.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,987.64 : 128,384.73 = 71,439 : x
  2. Step 2: Convert to fraction form
    92,987.64/128,384.73 = 71,439/x
  3. Step 3: Cross multiply
    92,987.64x = 128,384.73 × 71,439
  4. Step 4: Simplify right side
    92,987.64x = 9,171,676,726.47
  5. Step 5: Solve for x
    x = 9,171,676,726.47/92,987.64
  6. Step 6: Final answer
    x = 98,633.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.